Use the mouse to draw on the canvas below -- all other browser windows open on this page see your drawing in realtime and you can see any of theirs as well.

The lws-mirror protocol doesn't interpret what is being sent to it, it just re-sends it to every other websocket it has a connection with using that protocol, including the guy who sent the packet.

libwebsockets-test-client joins in by spamming circles on to this shared canvas when run.